US8385298B2 - Wireless communication system, control center, and base station - Google Patents

Wireless communication system, control center, and base station Download PDF

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US8385298B2
US8385298B2 US12/700,247 US70024710A US8385298B2 US 8385298 B2 US8385298 B2 US 8385298B2 US 70024710 A US70024710 A US 70024710A US 8385298 B2 US8385298 B2 US 8385298B2
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base station
data
reception quality
control center
time slot
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US20100232399A1 (en
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Kazuya Negishi
Keiji Yamamoto
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Toshiba Corp
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Toshiba Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

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  • the present invention relates to a wireless communication system, a control center, and a base station for providing a wireless communication service to a mobile terminal.
  • a cell site design is not performed when a base station is installed. Accordingly, the positional relationship between base stations must be measured by a person. Further, since a large number of microcells are used as base stations in the PHS system, the measurement takes longer time.
  • Jpn. Pat. Appln. KOKAI Publication No. 2006-86631, Jpn. Pat. Appln. KOKAI Publication No. 9-233521, and Jpn. Pat. Appln. KOKAI Publication No. 8-9447 disclose approaches of constructing data (adjacent base station data) indicating adjacency relationship between base stations at the time of hand-over of a mobile terminal or switch of a waiting base station. In these approaches, however, since the construction of data on adjacent base stations depends on terminals, an enormous amount of time is required so as to construct adjacent base station data. Further, when the range in which mobile terminals move is limited, the adjacent base station data to be generated will be local and wide-scale adjacent base station data cannot be constructed.
  • a wireless communication system including a plurality of base stations and a control center, the base station being configured to transmit control data used to service a mobile terminal via a control channel in a time slot selected from plurality of time slots autonomously, the control center being configured to connect to the base station via a transmission path and control the base station, the base station including: a notification module configured to notify the control center of output power data via the transmission path, the output power data indicating an output power of the base station; a measurement module configured to measure a reception quality of each time slot from received radio signals of control data transmitted from other base stations via the control channel; and a transmission module configured to transmit reception quality data indicating the reception quality of each time slot to the control center via the transmission path, along with data indicating the time slot selected by the base station, wherein the control center includes: a reception module configured to receive the output power data, the reception quality data, and the data indicating the time slot from the base station; and a construction module configured to construct adjacent base station data indicating adj
  • a control center used in a wireless communication system including a plurality of base stations and a control center, the base station being configured to transmit control data used to contain a mobile terminal via a control channel in a time slot selected from plurality of time slots autonomously, the control center being configured to connect to the base station via a transmission path so as to control the base station, the control center including: a reception module configured to receive output power data, reception quality data, and data indicating a time slot, the output power data indicating output power of the base station transmitted via the transmission path from the base station, the reception quality data indicating reception quality of each time slot measured by received radio signals of control data transmitted from other base stations via the control channel, the data indicating the time slot being selected by the base station; and a construction module configured to construct adjacent base station data indicating adjacency relationship between base stations by comparing the reception quality with the output power of each of the mobile base stations, the reception quality being obtained by converting the reception quality data based on the time slot.
  • a base station used in a wireless communication system including a plurality of base stations and a control center, the base station being configured to transmit control data used to contain a mobile terminal via a control channel in a time slot selected from plurality of time slots autonomously, the control center being configured to connect to the base station via a transmission path and control the base station, the base station including: notification module configured to notify the control center of output power data via the transmission path, the output power data indicating an output power of the base station; a measurement module configured to measure a reception quality of each time slot from received radio signals of control data transmitted from other base stations via the control channel; and a transmission module configured to transmit reception quality data indicating the reception quality of each time slot to the control center via the transmission path, along with data indicating the time slot selected by the base station.
  • FIG. 1 is an overall configuration of a wireless communication system according to an embodiment of the present invention
  • FIG. 2 is a functional block diagram illustrating an exemplary configuration of a wireless communication system according to the first embodiment
  • FIG. 3 illustrates received radio signals of control data transmitted via a control channel from other base stations
  • FIG. 4 illustrates periodicity of a control channel of a base station
  • FIGS. 5A and 5B illustrate an example of adjacent base station data constructed based on reception power data
  • FIG. 6 is a sequence diagram illustrating an operation of the wireless communication system of FIG. 2 ;
  • FIG. 7 illustrates a hand-over prediction process
  • FIG. 8 illustrates an example of hand-over history data
  • FIG. 9 illustrates a functional block diagram illustrating an exemplary configuration of a wireless communication system according to the second embodiment
  • FIGS. 10A and 10B illustrate an example of adjacent base station data constructed based on error rate data
  • FIG. 11 is a sequence diagram illustrating an operation of the wireless communication system of FIG. 9 .
  • FIG. 1 illustrates an overall configuration of a wireless communication system according to an embodiment of the present invention.
  • the wireless communication system includes base stations CS 21 to CS 2 n (which will be collectively referred to as base station CS) and a control center S 1 .
  • the control center S 1 is connected to a plurality of base stations CS via a cable, and controls the base stations CS.
  • the control center S 1 is further connected to an Internet Protocol (IP) network 2 and a public switched telephone network 3 , as shown in FIG. 1 , and is capable of performing communication via the Internet 4 .
  • IP Internet Protocol
  • the base station CS transmits control data for servicing a mobile terminal PS 1 via a control channel in an autonomously selected time slot.
  • the mobile terminal PS 1 selects a destination base station CS based on the control data transmitted from the base station CS and communicates using a wireless protocol.
  • the mobile terminal PS 1 performs a hand-over process of switching the base station CS which is to be communicated with the mobile terminal PS 1 according to movement of the mobile terminal PS 1 .
  • FIG. 2 is a functional block diagram illustrating an exemplary configuration of a base station and a control center according to the first embodiment.
  • the base station CS includes a call connection module 101 , a hand-over control module 102 , an output power notification module 103 , a reception power measurement module 104 , and a reception power transmission module 105 .
  • the call connection module 101 performs call connection to the mobile terminal PS 1 .
  • the hand-over control module 102 performs control so as to switch the connection destination of the mobile terminal PS 1 to another base station CS, when the quality of communication between the base station CS and the mobile terminal PS 1 has deteriorated.
  • the output power notification module 103 transmits output power data indicating output power (maximum output power, for example) output by the base station CS to the control center S 1 upon activation. It is to be noted that the output power may be the strength of radio signals, as well as electric power represented by W, dBm, or the like.
  • the reception power measurement module 104 measures the reception power of the radio signals transmitted by other base stations by searching the control channel in each time slot, and selects a time slot in which the control data of the base station should be transmitted. It is to be noted that the reception power to be measured may be the strength of electric field represented by V/m or dBV/m, for example, or other radio signals, as well as electric power represented by W or dBm.
  • the reception power transmission module 105 transmits reception power data indicating the reception power in each time slot and measured by the reception power measurement module 104 to the control center S 1 , along with the data indicating the selected time slot.
  • the control center S 1 includes a call connection module 101 , a hand-over control module 102 , an output power reception module 106 , a reception power reception module 107 , an adjacent base station data construction module 108 , an adjacent base station data memory 109 , a hand-over prediction module 110 , a hand-over history accumulation module 111 , and a hand-over history data memory 112 .
  • the output power reception module 106 receives the output power data transmitted from each of the base stations CS.
  • the reception power reception module 107 receives the reception power data and the data indicating the selected time slot transmitted by each of the base stations CS.
  • the adjacent base station data construction module 108 converts the reception power data received by the reception power reception module 107 into the reception power of each of the base stations CS based on the time slot, and compares the converted reception power and the output power of each of the base stations CS so as to construct adjacent base station data indicating adjacency relationship between the base stations.
  • the adjacent base station data memory 109 holds the adjacent base station data constructed by the adjacent base station data construction module 108 .
  • the hand-over prediction module 110 predicts a base station that should be a candidate to which the next hand-over of the mobile terminal PS 1 should be conducted, with reference to the adjacent base station data memory 109 .
  • the hand-over history accumulation module 111 accumulates hand-over history data indicating a history of the destination base station CS whenever the mobile terminal PS 1 performs hand-over.
  • the hand-over history data memory 112 holds hand-over history data accumulated by the hand-over history accumulation module 111 .
  • the hand-over history data memory 112 may include the period of time during which communication with the base station CS is performed, as well as the data on the destination base station CS. It is to be noted that the type (such as HDD and DRAM) of the storage is not specified.
  • FIG. 3 illustrates received radio signals of control data transmitted via a control channel from other base stations.
  • base station CS 21 receives radio signals W 11 , W 12 , W 13 from other base stations CS 23 , CS 24 , CS 25 in the communication area.
  • base station CS 22 receives radio signals W 14 , W 15 , W 16 from other base stations CS 25 , CS 26 , CS 27 , respectively, in the communication area.
  • Base stations CS 21 , CS 22 measure the reception power of the radio signals by causing the reception power measurement module 104 to search the control channel in each time slot.
  • the base station CS transmits a control channel in a cycle of 1.2 seconds, and synchronization is maintained by a synchronization signal transmitted from the control center S 1 .
  • the base station CS detects an unused time slot from a division (time slot) obtained by dividing the cycle of the control channel into 5 millisecond intervals, and autonomously selecting the detected one as a time slot for the base station CS. In this case, the selected time slot should not overlap with those of the other base stations. Utilizing the fact that the time slot selected by each of the base stations CS always has the same cycle (of 1.2 seconds), other base stations existing in the communication area can be searched for by retrieving a control channel having the cycle of 1.2 seconds.
  • the cycles are always of 1.2 seconds.
  • the adjacent base station data construction module 108 uses this periodicity in generating the adjacent base station data.
  • FIGS. 5A and 5B illustrate an example of adjacent base station data constructed based on the reception power data.
  • Each of the base stations CS causes the reception power transmission module 105 to notify the control center S 1 of the reception power data indicating the reception power in each time slot, along with data indicating the time slot of the control channel selected by each of the base station CS. Thereby, the control center S 1 recognizes which of the base stations CS uses the time slot of the control channel.
  • the adjacent base station data construction module 108 calculates approximate positional relationship between the base stations based on the reception power data.
  • FIG. 5A illustrates adjacent base station data obtained by converting the reception power data received by the control center S 1 from base station CS 21 of FIG. 3 into a reception power of each of the base stations, based on the time slot of the control channel, and associating the converted reception power with the output power notified from the base station.
  • FIG. 5A shows that base station CS 21 has received radio signals of reception power 10 from base station CS 23 , radio signals of reception power 30 from base station CS 24 , and radio signals of reception power 20 from base station CS 25 .
  • FIG. 5A illustrates adjacent base station data obtained by converting the reception power data received by the control center S 1 from base station CS 21 of FIG. 3 into a reception power of each of the base stations, based on the time slot of the control channel, and associating the converted reception power with the output power notified from the base station.
  • FIG. 5A shows that base station
  • 5B shows that base station CS 22 has received radio signals of reception power 5 from base station CS 24 , radio signals of reception power 20 from base station CS 25 , radio signals of reception power 11 from base station CS 26 , and radio signals of reception power 10 from base station CS 27 .
  • the output power transmitted by base stations CS 23 , CS 24 , CS 25 is equally 40, base station CS 24 is assumed to be the closest to base station CS 21 , and base station CS 23 is assumed to be the farthest from the base station CS 21 . Further, based on the adjacent base station data of base stations CS 21 , CS 22 , it can be calculated that the base station CS 25 is located in an intermediate point between base station CS 21 and base station CS 22 , and that base stations CS 26 , CS 27 are separated from base station CS 21 . Using such data, approximate positional relationship between the base stations CS of FIG. 3 can be reconstructed.
  • the data indicating the distance calculated in this way can be held in the adjacent base station data memory 109 as adjacent base station data, instead of the reception power data (or together with the reception power data).
  • FIG. 6 is a sequence diagram illustrating an operation of the wireless communication system.
  • base station CS 21 Upon completion of activation (S 1 a ), base station CS 21 causes the output power notification module 103 to notify the control center S 1 of the output power data indicating the output power transmitted by base station CS 21 (S 1 b ).
  • the control center S 1 causes the output power reception module 106 to receive the output power data notified from CS 21 and hold the output power data (S 1 c ).
  • base station CS 21 causes the reception power measurement module 104 to measure the reception power of radio signals transmitted by other base stations CS (Sid) by searching the control channel in each time slot, and select a time slot in which base station CS 21 should transmit.
  • the reception power data indicating the measured reception power is transmitted to the control center S 1 , together with the data indicating the selected time slot, by the reception power transmission module 105 (S 1 e ).
  • the control center S 1 converts the reception power data into the reception power of each base station based on the time slot notified from each of the base stations, and constructs adjacent base station data by comparing the converted reception power with the output power (S 1 f ).
  • the control center S 1 periodically requests base stations CS 21 , CS 22 of reception power data (S 1 g , S 1 j ).
  • base stations CS 21 , CS 22 cause the reception power measurement module 104 to measure reception power in each time slot from the received radio signals of the control channel (S 1 h , S 1 k ), and transmits the reception power data to the control center S 1 (s 1 i , S 1 l ).
  • FIG. 7 illustrates a hand-over prediction process using adjacent base station data.
  • FIG. 7 shows the state in which the mobile terminal PS 1 is serviced by base station CS 23 at first, and moves in the direction of base station CS 26 as time advances.
  • the hand-over history accumulation module 111 accumulates data indicating the history of the destination base station CS in the hand-over history data memory 112 , whenever the mobile terminal PS 1 performs hand-over.
  • FIG. 8 shows an example of the hand-over history data.
  • the hand-over prediction module 110 decides that the mobile terminal PS 1 has moved in the direction of base station CS 23 from base station CS 28 , based on the hand-over history data shown in the upper part of FIG. 8 .
  • the hand-over prediction module 110 recognizes that base station CS 21 and base station CS 25 are located in the proximity of base station CS 23 , based on the constructed adjacent base station data, and predicts that there is high possibility that hand-over will be performed to one of these base stations.
  • the hand-over prediction module 110 recognizes that base station CS 24 is in a position far from base station CS 23 , and predicts that there is low possibility that hand-over will be performed to base station CS 24 .
  • the hand-over prediction module 110 selects base station CS 25 from which base station CS 23 receives the strongest power as a candidate to which hand-over is to be conducted.
  • the hand-over prediction module 110 predicts that there is high possibility that hand-over is to be conducted to one of base stations CS 21 , CS 22 , CS 24 , based on the adjacent base station data. Further, the hand-over prediction module 110 selects base station CS 22 , from which the strongest power is received, as a candidate to which hand-over is to be conducted. As the mobile terminal PS 1 moves, the hand-over history data will be updated as shown in the lower part of FIG. 8 .
  • the hand-over prediction module 110 has selected a candidate to which hand-over is to be conducted according to the strength of the reception power in the present embodiment, a base station having a large amount of remaining resources (vacant spectrum in communication channel) may be selected, when there is no big difference in the value of the reception power.
  • FIG. 9 is a functional block diagram illustrating an exemplary configuration of a base station and a control center, according to the second embodiment.
  • the base station CS of FIG. 9 includes an error rate measurement module 204 and an error rate transmission module 205 , instead of the reception power measurement module 104 and the reception power transmission module 105 of FIG. 2 .
  • the control center S 1 of FIG. 9 includes an error rate reception module 207 , instead of the reception power reception module 107 of FIG. 2 .
  • the structural elements same as those of FIG. 2 are denoted by the same reference numbers, and detailed descriptions of such elements will be omitted.
  • the error rate measurement module 204 measures an error rate of radio signals transmitted from other base stations by searching the control channel in each time slot, and selects a time slot in which control data of the base station CS should be transmitted.
  • the error rate transmission module 205 transmits error rate data indicating an error rate of each time slot measured by the error rate measurement module 204 to the control center S 1 , together with the selected data indicating the time slot.
  • the error rate reception module 207 receives error rate data transmitted from each of the base stations CS and data indicating the selected time slot.
  • the adjacent base station data construction module 108 converts the error rate data received by the error rate reception module 207 into the error rate of the base station CS based on the time slot, and constructs adjacent base station data indicating adjacency relationship between base stations, based on the relationship between the converted error rate and the output power of each of the base stations CS.
  • FIGS. 10A and 10B illustrate an example of adjacent base station data constructed using an error rate instead of the reception power.
  • FIG. 10A shows error rate data that is received by the control center S 1 from base station CS 21 , converted into the error rate of each base station based on the time slot of the control channel, and associated with the output power notified from the base station.
  • the output power transmitted by base stations CS 23 , CS 24 , CS 25 is equal, it can be decided that the base station with the lower error rate is closer to base station CS 21 .
  • base station CS 25 is assumed to be the closest to base station CS 21
  • base station CS 24 is assumed to be the farthest from base station CS 21 .
  • the index indicating the distance is x
  • the output power of the base station is max
  • the error rate of the radio signals received from other base stations is Err.
  • the data indicating a distance calculated in this way may be held in the adjacent base station data memory 109 as the adjacent base station data, instead of the error rate data (or together with the error rate data).
  • FIG. 11 is a sequence diagram illustrating the operation of the wireless communication system of FIG. 9 .
  • base station CS 21 Upon completion of activation (S 2 a ), base station CS 21 causes the output power notification module 103 to notify the control center S 1 of the output power data indicating the output power transmitted by base station CS 21 .
  • the control center S 1 causes the output power reception module 106 to receive output power data notified from base station CS 21 , and hold the notified output power data (S 2 c ).
  • base station CS 21 causes the error rate measurement module 204 to measure the error rate of radio signals transmitted by other base stations CS by searching the control channel in every time slot (S 2 d ), and selects a time slot in which base station CS 21 should transmit.
  • the error rate data indicating the measured error rate is transmitted by the error rate transmission module 205 to the control center S 1 , together with the data indicating the selected time slot (S 2 e ).
  • the control center S 1 converts the error rate data into the error rate of each of the base stations, based on the time slot notified from the base station, and constructs the adjacent base station data based on the relationship between the error rate and the output power (S 2 f ).
  • the control center S 1 periodically requests base stations CS 21 , CS 22 of error rate data (S 2 g , S 2 j ).
  • base stations CS 21 , CS 22 cause the error rate measurement module 204 to measure the error rate in each time slot from the received radio signals of the control channel (S 2 h , S 2 k ), and transmits the error rate data to the control center S 1 (S 2 i , S 2 l ).
  • the hand-over prediction module 110 predicts a candidate base station to which the next hand-over of the mobile terminal should be conducted, based on the constructed adjacent base station data. Since it can be decided that the base station with the lower error rate in the constructed adjacent base station data is closer to the base station, the hand-over prediction module 110 selects a base station with the lowest error rate as a candidate to which the next hand-over is to be conducted. It is to be noted that the hand-over prediction module 110 may select a base station having a large amount of remaining resources (vacant spectrum in communication channel) when there is no big difference in the value of error rate.
  • control center is capable of constructing adjacent base station data without depending on terminals. Further, the adjacent base station data can be constructed immediately after installation of a new base station.

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  • Computer Networks & Wireless Communication (AREA)
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US20140092879A1 (en) * 2012-10-02 2014-04-03 Zte Wistron Telecom Ab Downlink transmission point selection in a wireless heterogeneous network
WO2019163273A1 (ja) * 2018-02-20 2019-08-29 ソニー株式会社 通信装置及び通信方法

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